PreferencesActivity.java

package com.maciekjanusz.compassproject.preferences;

import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;

import com.maciekjanusz.compassproject.R;

import butterknife.Bind;
import butterknife.ButterKnife;

public class PreferencesActivity extends AppCompatActivity {

    @Bind(R.id.toolbar) Toolbar toolbar;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_preferences);
        ButterKnife.bind(this);

        setSupportActionBar(toolbar);
        ActionBar actionBar = getSupportActionBar();
        if(actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        switch (id) {
            case android.R.id.home:
                // provide up navigation
                NavUtils.navigateUpFromSameTask(this);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }
}